Inleakageproof structure for escape opening of a coil-type compressor

ABSTRACT

An inleakageproof structure for escape opening of a coil-type compressor. An outer wall face of the fixed coiled body of the compressor is formed with an annular oil groove around the escape opening. The oil groove is formed within a range covered by the valve plate. A valve plate is disposed on the outer wall face of the fixed coiled body corresponding to the escape opening. An oil liquid exhausted from the escape opening is contained in the oil groove. By means of capillarity of the oil liquid in the oil groove, the oil liquid automatically seals a gap between the valve plate and the outer wall face of the fixed coiled body.

BACKGROUND OF THE INVENTION

[0001] The present invention is related to an inleakageproof structure for escape opening of a coil-type compressor. The inleakageproof structure includes an annular oil groove formed on outer wall face of a fixed coiled body around the escape opening. An oil liquid exhausted from the escape opening is contained in the oil groove. By means of capillarity of the oil liquid in the oil groove, the oil liquid automatically seals a gap between the valve plate and the outer wall face of the fixed coiled body to avoid the problem of inleakage.

[0002]FIG. 4 shows a conventional coil-type compressor. A fixed coiled body 81 and a movable coiled body 82 are disposed in a housing 8. The fixed coiled body 81 is formed with an escape opening 811 for the compressed gas to escape into the compressed gas chamber 84. A resilient valve plate 83 is disposed on outer wall face of the fixed coiled body 81 corresponding to the escape opening 811. In normal state, the valve plate 83 resiliently seals the escape opening 811.

[0003] When the movable coiled body 82 is rotated relative to the fixed coiled body 81 to compress the gas, the compressed high pressure gas will push away the valve plate 83 to unblock the escape opening 811. At this time, the high pressure gas can escape from the escape opening 811. After escaping, the valve plate 83 due to its own resilience again seals the escape opening 811.

[0004] A minor gap inevitably exists between the valve plate 83 and the wall face 812 around the escape opening 811 due to precision of the processed surface. As a result, the high pressure gas in the compressed gas chamber 84 will flow back through the gap between the valve plate 83 and the escape opening 811. This leads to a problem of inleakage. Furthermore, the rotational speed of the compressor is up to several thousand rpm. That is, the valve plate 83 will open and close several thousand times per minute. As a result, after a period of use, the valve plate 83 will deform and can hardly fully seal the escape opening 811. Under such circumstance, the high pressure gas in the compressed gas chamber 84 will flow through the gap between the valve plate 83 and the escape opening 811 back into the space between the fixed coiled body 81 and the movable coiled body 82 as shown in FIG. 5. This leads to more serious problem of inleakage. Accordingly, the efficiency of the compressor will be reduced.

SUMMARY OF THE INVENTION

[0005] It is therefore a primary object of the present invention to provide an inleakageproof structure for escape opening of a coil-type compressor. The inleakageproof structure includes an annular oil groove formed on outer wall face of a fixed coiled body around the escape opening. An oil liquid exhausted from the escape opening is contained in the oil groove. By means of capillarity of the oil liquid in the oil groove, the oil liquid automatically seals a gap between the valve plate and the outer wall face of the fixed coiled body to avoid the problem of inleakage.

[0006] It is a further object of the present invention to provide the above inleakageproof structure in which due to surface tension, the level of the oil liquid in the oil groove is slightly higher than the outer wall face of the fixed coiled body. Accordingly, when the valve plate is closed to a position near the outer wall face, due to capillarity, the oil liquid will be attracted to attach to the valve plate so as to previously seal the escape opening. Accordingly, the possibility of backflow of the high pressure gas is minified.

[0007] The present invention can be best understood through the following description and accompanying drawings wherein:

BRIEF DESCRIPTION OF THE DRAWINGS

[0008]FIG. 1 is a sectional view of the present invention;

[0009]FIG. 2 is a sectional view according to FIG. 1, showing that the valve plate is slightly opened;

[0010]FIG. 3 is an enlarged view showing that the oil liquid in the oil groove seals the gap between the valve plate and the outer wall face of the fixed coiled body of the present invention;

[0011]FIG. 4 is a sectional view of a conventional coil-type compressor; and

[0012]FIG. 5 is an enlarged view showing the inleakage of high pressure gas existing in the conventional coil-type compressor.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0013] Please refer to FIGS. 1 to 3. The present invention provides an inleakageproof structure for escape opening of a coil-type compressor 1. A fixed coiled body 11 and a movable coiled body 12 are disposed in the compressor 1. The fixed coiled body 11 is formed with an escape opening 111. A valve plate 13 is disposed on outer wall face 112 of the fixed coiled body 11 corresponding to the escape opening 111. The outer wall face 112 is formed with an annular oil groove 113 around the escape opening 111 within a range covered by the valve plate 13. The oil liquid exhausted from the escape opening 111 is contained in the oil groove 113. By means of capillarity of the oil in the oil groove 113, the oil will automatically seal the gap between the valve plate 13 and the outer wall face 112. In addition, a stop board 14 is disposed on the fixed coiled body 11, whereby the valve plate 13 is sandwiched between the stop board 14 and the fixed coiled body 11. The stop board 14 serves to restrict the extent to which the valve plate 13 is opened. After the movable coiled body 12 is rotated relative to the fixed coiled body 11 to compress the gas, the high pressure gas pushes away the valve plate 13 to unblock the escape opening 111. At this time, the high pressure gas can escape from the escape opening 111 and go into the compressed gas chamber 15. After escaping, the valve plate 13 due to its own resilience again seals the escape opening 111 to avoid backflow of the high pressure gas.

[0014] The oil groove 113 around the escape opening 111 contains therein an oil liquid A (such as freezing oil) exhausted from the escape opening 111. Due to surface tension, the level of the oil liquid A will be slightly higher than the outer wall face 112. Accordingly, before the valve plate 13 fully contacts with the outer wall face 112, the valve plate 13 will first contact with the oil liquid A in the oil groove 113 as shown in FIG. 2. By means of capillarity of the oil liquid A, the oil liquid A will seal the minor gap between the valve plate 13 and the outer wall face 112. Accordingly, the escape opening 111 is previously sealed to minify the possibility of backflow of the high pressure gas in the compressed gas chamber 15. Furthermore, in the case that the valve plate 13 deforms after a period of use, under the capillarity, the oil liquid A in the oil groove 113 will automatically seal the enlarged gap between the valve plate 13 and the outer wall face 112 as shown in FIG. 3. Accordingly, the high pressure gas in the compressed gas chamber 15 is prevented from flowing back into the space between the fixed coiled body 11 and the movable coiled body 12 so that the problem of inleakage is avoided.

[0015] The above embodiment is only used to illustrate the present invention, not intended to limit the scope thereof. Many modifications of the above embodiment can be made without departing from the spirit of the present invention. 

What is claimed is:
 1. An inleakageproof structure for escape opening of a coil-type compressor, a fixed coiled body and a cooperative movable coiled body being disposed in the compressor, the fixed coiled body being formed with an escape opening, a valve plate being disposed on outer wall face of the fixed coiled body corresponding to the escape opening, whereby after the movable coiled body is rotated to compress the gas, the high pressure gas pushes away the valve plate to unblock the escape opening, permitting the high pressure gas to escape from the escape opening, said inleakageproof structure being characterized in that the outer wall face of the fixed coiled body is formed with an annular oil groove around the escape opening within a range covered by the valve plate, an oil liquid exhausted from the escape opening being contained in the oil groove, whereby by means of capillarity of the oil liquid in the oil groove, the oil liquid automatically seals a gap between the valve plate and the outer wall face.
 2. The inleakageproof structure for escape opening of a coil-type compressor as claimed in claim 1, wherein a stop board is disposed on the fixed coiled body corresponding to the valve plate, whereby the valve plate is sandwiched between the stop board and the fixed coiled body, the stop board serving to restrict the extent to which the valve plate is opened. 